Re: Using DNS response fields in an alert msg

["Joel Esler (jesler)" <jesler () cisco com>]

We have additional functionality being added to OpenAppId in 2.9.8 in DNS.  I don't think it will answer your entire 
use case here though. 

--
Joel Esler 
Sent from my iPhone

> On Jan 7, 2015, at 8:23 AM, David Longenecker <david () 7longeneckers com> wrote:
>
> Hi snort folks, I'm looking for a bit of education. Forgive me if this is not the right forum for questions like this.
>
> Over the holiday break, I spent some time with snort and opendns, inspecting DNS responses to detect potential 
> malicious activity on the local network. The idea was, opendns does a good job of *blocking* malicious content by 
> responding with a warning landing page instead of the actual address; I can use that to *alert* when a blocked page 
> is requested. I look for several known landing pages in the dns answer record, and trigger an alert.
>
> It works pretty well, with one shortcoming: the alerts identify the offending device, but not the name request. I 
> have to go back to the packet capture afterward to determine the requested domain. Does anyone on this list have an 
> example of snort parsing a dns response into its component name and address fields, and using these fields in the 
> alert message?
>
> Project description: http://dnlongen.blogspot.com/snort-dns
> Just the rules: https://github.com/dnlongen/snort-dns
>
>
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sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net

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